Fuel pump



May 19, 1931. w. H. scHuLzE 1,806,268

FUEL PUMP Filed March 8. 1929 as 3150212@ ys till Patented May 19, 1931 f STATUES PATENT @FFME WILLIAIE H. SCHULZE, F CHICAGO,

POMTION, 0F CHICAGO,

FUEL EUMP Application tiled March S, wat). Serial No. 345,396.

The purpose of this invention is to provide a pumpingdevice adapted to be mounted on the crank case ot an engine to be served by it for supplying fuel to the engine carburetor level than the carbureter or device.

'lhe specic purpose with respect to which the device is designed in detail, is to make the udevice in its entirety compact in form and without exposing moving parts, and having said movable parts suitable for deriving pumping movement from an engine cam with which the structure co-operates in such a manner that the cam cycle has an active and an idle phase, and the pumping member of the pumpin device derives its intalre stroke positively rom the cam in the active hase of the cam cycle, and derives its tee ing stroke in the idle phase of the cam cycle trom-the reaction of a spring which is conditioned for such reaction by the cam in its active phase simultaneously with the communication of the intake stroke.

And in this mode of operationl it is a :further specific purposeoi1 the invention to arrange for the part Which is actuated by the cam in the active phase of the cam cycle to tollovv the cam in the idle phase so as to avoid the annoying and harmful impact ot" the cam on the actuated part by the/recurrence ot the intake phase, and to maire this possible by provision for lost motion between the positively actuated part and the pumping member in the movement of the former for following the cam in the idle phase ot the cam cycle. lThe invention consists in the elements and ieatures ot construction shown and described as indicated in the claims.

ln the drawings:

Figure l is a vertical section ot a structure embodying one form of the invention showing the moving parts at the position occupied at the end ot the fuel intake stroke ot the pumping member.

ltligure 2 is a similar view showing said arts at the position occupied at the end ot tull feeding strolre.

the pumping from a fuel source at a lowerv Referring to the drawings the structure shown comprises two casing members, A and B having clamped between them a iiexible diaphragm, C, partitioning recesses, and 3l, in the mated faces of said members, respectively, of which the recess, 30, thus becomes the pumping chamber with the diaphragm constituting a Wall member movable for enlarging and reducing the chamber for its pumping action. The casing member, A, has fuel inflow connection, indicated at l0, controlled by a valve 11, and fuel discharge connection indicated at 20, controlled by a valve, 21. rThe casing member, B, at the end opposite that at which the diaphragm is clamped, is tlat for mounting at and closing an aperture, 6l, in the engine casing indicated at *60, the diaphragm operating stem, 50, being extended through and obtaining guide bearing in the flat portion of the Wall of the casing member, B, which is re'istered With and closes the aperture, 61. aid registered portion ot the wall ot said casing member, B, carries a bracket, 87,` which projects into the cavity ot. the engine casing and supports, as seen at 8l, the fulcrum ot a bell crank lever, 80, one arm of which is extended for actuation by the engine cam, 71, While the other arm, 82, is connected by a pair of toggle linlrs, 83 and 84, with the diaphragm stem, 50, said links being provided with cooperating stops, 85 and 86, limiting their approach to alignment in the movement communicated by the bell crank lever upon its movement in the active phase of the cam, so that in said active phase the diaphragm is retract ed against the reaction of the s ring, t0, for the intake stroke ot the diap iragm.

For causing the cam-actuated lever to ollow the cam in the idle phase of the cam cycle, there is provided a stretched spring, 55, connected at one end to the arm, 82, ot the bell crank lever, and at the other end to the casing member, B, as indicated at a. Jand it will be seen that the movement ot the lever in thus tollovvin the cam in the idle phase is accommodate by the toggle linlrs which in this movement ot the'lever are folded together, withdrawing their stops trom each titi ated lever which allows the dia with an 'said stem carried by the pum the outer sideI of said casing wit in the area other and thus avoiding communicating movement to the diaphragm from the movement ofthe lever in thus following the cam.

Upon consideration of the structure it-will be recognized'that thel provision which -permits the lever to-follow the cam in' its idle phase constitutes a lost motion connection between the diaphragm and the cam-actuhragm to receive from the spring,-40, fee ing movement greater or less, according to the engine requirements, which are thus supplied under substantially uniform pressure exerted by the reaction of the spring, 4.0.

It may also be noted thatl the form of the pum casing member, B, vterminating with the at wall closes the aperture in the engine casing, and which carries on the outer side in position for being entered into the engine casing all the operatin connections by which the umping mem er derives actuation from t e engine cam, so that no space is required for these connections or. for their movements within the pump casing, and thus permits the pump casing to be limited in size to the dimension necessary to accommodate the diaphra and the spring for glving it its. feeding stroke.

I claim:

1. A pumping device adapted for mounting on an engine casing for protruding thereinto an operating element to be actuated by an engine cam, saidw pumping device comprising a casing having a pumping chamber and a pumping member therein operating stem protruding from the casing at the 'side thereof arrangedfor mountin on the engine casing at anaperture in t e latter; operating connections for casing on registered with the engine casing aperture, sald connections comprising a lever `fulcrumed on the pump casing and having operating connections with the pumping member stem, said connections consisting of a pair of toggle links pivotally connected respectively to said stem and said lever and pivoted together and having co-operating stops arranged for encounter tol sto the relative ivotal movement of the lin s in the directlon for aligning all their pivots, with the pivpt-in-common out of such alignment, said links being free for relative pivotal movement in the direction for folding them together.

2. A pumping device arranged to be mounted on an engine casing for protruding thereinto an operating element to be actuated by an engine element, comprising a pump casing containing a pumping chamber and a pumping member ltherein having a reciprocating stem journalled in and rotruding from the casing at a side thereo arsaid connections gm and its movementl recense ranged for mounting on the engine caslnlg at an aperture in the latter, the casi w at the side thus mounted and in whic said stem is journalled being substantially closed over the entire area thereof which 1s registered with the engine casing aperture for mounting iat against the engine casing, connections for operating the pumping member stem carried by said. iiat wall of the pump casi eing wholly within the ene casing and comprising a lever arranged or cooperation with an engine cam for' positive actuation in one phase of the cam cycle and free from such actuation in another phase of the cam cycle. 4

3. A pumping apparatus comprising a pump casing, a reciprocating pumping memer therein having an operating stem protruding from the casing, actuating means for said stem comprising a lever and operating -connections with the stem, said lever being' mounted on the casing exteriorly thereof, said pump casing being arranged for mounting on an engine casing at an aperture in the latter, the stem actuating means being arranged for protruding into the engine casing through the aperture thereof for co-operation of said actuating means with an engine cam; the operating connections comprising a pair of toggle links pivoted together having co-operating stops arranged for connection to' 'stop their relative movement in the direction for aligning them, with their pivot-in-common out of ali nment with theirend pivots, said-links belng free for relative pivotal movement in the direction for folding them together.

Intestimony'whereof, I have hereunto set my hand at Chicago, illinois, this 4 day of March', 1929.

WILLIAM H. SCHULZE.

at said registered area,- 

